Insulated rail-chair



(No Mod1.)-

L; MOCARTHY. INSULATEDVRAIL CHAIR.

N0.51s,950. A Patented Jan. so, 1894.

' iii-15:11 I

NITED STATES PATENT Erica.

LOUIS MCOARTHY, OF BOSTON, MASSACHUSETTS.

INSULATED RAIL-CHAIR.

SPECIFICATION forming part of Letters Patent No. 513,950, dated January30, 1894. Application filed September 27, 1892. Serial No, 447.004. (Nomodel.)

erence being had therein to the accom pany-l ing drawings.

My invention has for its object to provide an insulated rail-chair forrailways which" shall be strong and durable and which shally effectivelyinsulate the rails and it consists in a rail-chair constructed ashereinafter seti forth and the novel features of whichV are pointed outin the claims which are appended hereto and made a part hereof.

I have shown my invention in the best form now known to me in theaccompanying drawings, in which- Figure l is a perspective showing myimproved chair with a portion of the ends of two rails attached thereto.Fig. 2 is a transverse section on line 2-,2 Fig. 1.

Having reference to the drawings, Ais a portion of a sleeper.

B is the bed or base piece of the chair which may rest on the sleeper.The bed B is provided with holes c to receive securing bolts d, thesebolt holes being at their upper portions less in diameter than the headsof the bolts, but below the contracted portion being sufficientlyenlarged to accommodate the heads of the bolts as also the surroundingmass of insulating'material f. The insulating material employed ispreferably sheet mica. A layer of this material is placed 011 top of thebed piece and a top plate of metal g is placed above this insulatinglayer, said plate serving not only as a rest for the base of the rail,but also to compress and retain the insulating layer. Cheek pieces j ofa shape to fit the base and web of the rail D are provided and these areextended laterally to receive securing bolts d. Each of the pieces j isalso preferably provided at the edges with a skirt or over-hang k whichoperates to shed moisture and protect the insulation. The horizontalbolts Z are employed which pass through the web of the rail as alsothrough the vertical portions of the cheek pieces and serve to hold therail securely in place. The edges of the insulation which is placedbetween the bed B and top-plate g are protected by a casing m preferablyof rubber or similar non-cond ucting material which may be molded aroundthe chair after it has been put together and prepared for the receptionof the rail and cheek pieces.

The parts are put together as follows: A series of sheets of mica whichhave been out to the proper shape to fit the enlarged portion of thebolt holes in thebed pieces are strung on the bolts d. Another series ofsheets of mica of a size to fit thev smaller portions of the said boltholes are also strung on the bolts. A sufficient number of larger sheetsof mica to form the required thickness of insulation between the bed Band the plate g and which have been provided with holes for the bolts dare then laid on the bed and upon them is placed the plate g whichisalso provided with holes for the reception of the bolts d. The boltsand theirinsulating material having been introduced into the holes c inthe bed B, and the stems thereof being passed through the holes in theplate g, the nuts p are then screwed firmly onto the bolts binding thebed and plate firmly together and compacting and compressing the micainsulation. Sheets of mica are'placed around the edges of the heads ofthe bolts. The heads of the bolts are preferably rounded as shown andbeneath them is placed a layer of mica of the-proper thick ness.`Concaved plugs q are then driven or shrunk into the lower Aportions ofthe bolt holes. The plug q should completely fill the holes to preventthe admission of moisture to the insulation. The casing m is then moldedaround the sides of the chair Vand it is ready for use. The rails areplaced on the chair and the cheek pieces applied and secured by nuts ron the bolts d and by-horizontal bolts l as will be clear from Fig. 2. pThe chair may be spiked or secured in any well known manner to thesleeper. It will also be obvious that the chair may be used to supportthe middle portions of the rails as well as the end portions. The lengthor other dimensions of the chair as also the number of bolts employed isnot material. Mica is especially valuable as an insulating material tobe used in this device because of its high insulative quality, is notaffected by changes of temperature,

IOO

and when compacted and compressed is uuyielding under pressure or strainand very durable.

l. An insulated rail-chair comprising a bedpiece provided with holes forthe reception of securing bolts, a top-plate, a layer of insulatingmaterial between the bed-piece and the top-plate, cheek-pieces appliedto the upper surface of said top-plate, securing bolts fitted to theholes in the bed-piece and holding both the said top-plate and thecheek-pieces in place, and insulating material surrounding the bolts inthe holes of the bed-piece.

2. An insulated rail-chair comprising a bedpiece provided with holes forthe reception of securing bolts, a top-plate, a layer of insulatingmaterial between the bed-piece and the top-plate, cheek-pieces appliedto the upper surface of said top-plate, securing bolts fitted to theholes in the bed-piece and passing through both the top-plate and thecheekpieces and holding both the said top-plate and the cheek-pieces inplace, and insulating material surrounding the boltsin the holes of thebedpiece.

3. An insulated rail-chair comprising abedpiece provided with holes forthe reception of securing bolts, a top-plate, a layer of insulatingmaterial between the bed-piece and the top-plate, securing bolts havingtheir inner ends tiXed in the holes in the bed-piece and surrounded byinsulating material and having their stems passed through the insulatinglayer and top-plate, cheek-pieces through which the stems of the boltsalso pass and nuts on the bolts above the cheek-pieces, substantially asdescribed.

4. An insulated rail-chair comprising a bedpiece provided with holes forthe reception of 4o securing bolts, a top-plate, a layer ot insulatingmaterial between the bed-piece and the top-plate, securing bolts havingtheir inner ends fixed in the holes in the bed-piece and surrounded byinsulating material and having their stems passed through the insulatinglayer and top-plate, nuts on the said bolts above the top-plate,cheek-pieces through which the stems of the bolts also pass and nuts onthe bolts above the cheek-pieces, substantially as described.

5. An insulated rail-chair comprising abedpiece, a top plate, aninterposed layer of insulating material, suitable securing devicestherefor, and a casing of insulating material surrounding the sides, ofthe bed-piece and the top-plate to protect the insulating materialbetween them substantially as and for the purposes set forth.

6. The combination with an insulated rail chair of cheek pieces extendedlaterally and provided with a skirt or overhang substantially as and forthe purposes set forth.

7. In an insulated rail-chair the combination of the bed piece B, thetop plate g, au insulating layer interposed between said top plate andsaid bed piece, the cheek-pieces securing bolts d set in holes in saidbed piece and insulated therefrom and provided with nuts for holding thetop-plate and cheekpieces in place and plugs q for closing said holes,substantially as setforth.

ln testimony whereof I aliix my signature in presence of two witnesses.

LOUIS MCCARTHY. lVitnesses:

WM. A. MAoLEoD, A. H. MORRISON.

